I always keep my car really clean. Why my car and not my bedroom, I have no idea. But it is important to me to have a clean car, so when other people borrow it and leave trash in it it drives me crazy.
I walked out to my car the other day after a certain family member borrowed it a couple times, and I noticed there were books and things on the front seat. That's not a big deal, though, because actual stuff that said borrower leaves will be cleaned out by necessity sooner or later, and at least it's not trash. But then I noticed the cup holders had both become home to half empty drink containers.
A surge of annoyance resulted in my yelling: "Holy mother!" It was louder than I expected it to be, and I realized there were people standing in their open garage across the street. Yep, I just yelled "holy mother" to myself, by myself, for no apparent reason in the presence of strangers.
And even though the books were cleaned out, and I asked the borrower to also remove the drinks along with them and got a reply in the affirmative... borrower didn't. And I had to throw them away.